Vertex O Series is an enterprise indirect tax engine. Companies that search for Vertex alternatives are usually mid-market or growing businesses that need registration, filing, and notices handled, not just an engine, at prices they can see. Kintsugi, powered by Vertex, does both. This guide covers why teams look elsewhere, six alternatives, and how moving to Kintsugi works.
Disclosure: Kintsugi publishes this guide. Vertex is a minority investor in Kintsugi and a commercial partner. Kintsugi, powered by Vertex, pairs Vertex's O Series tax engine with Kintsugi's automation, so choosing Kintsugi doesn't have to mean leaving the Vertex engine behind. Every other competitor figure comes from that vendor's public pages, checked on September 26, 2026.
Why Kintsugi is the #1 Vertex alternative
Kintsugi, powered by Vertex, gives growing companies the Vertex O Series engine plus registration, filing, and state notices, at published starting prices and without a quote to get started.
- Pricing you can see. A free plan, then paid plans from $75 per filing or registration. No per-state subscription, no onboarding fees, no transaction fees, and no long-term contract lock-in.
- The whole workflow in one place. Exposure monitoring, AI product categorization, registration, filing and remittance, refunds and amendments, deregistration, exemption certificates, and a virtual mailbox for state notices.
- Support that's included. Onboarding assistance and 24/7 live chat with same-day human responses on Starter; dedicated onboarding and account teams with SLA-backed support on Premium.
- Backed by the Kintsugi Guarantee. If our calculation or filing error leads to penalties or interest, we pay it.
- Room to grow. 60+ integrations, 13,000+ US jurisdictions, and Canada, the EU, the UK, and 100+ countries on Premium, with 7,000+ customers.
| Kintsugi | Vertex | |
|---|---|---|
| Published pricing | ✓ | ✗ Not published |
| Free plan | ✓ | ✗ None listed |
| Registration, filing, and notices in one plan | ✓ | Quote-based |
| Error guarantee | ✓ Kintsugi Guarantee | Not published on its O Series page |
Kintsugi's international coverage and the Kintsugi Guarantee are on Premium. Competitor details come from each vendor's public pages, checked September 26, 2026.
Switch to Kintsugi: start free, see pricing, or book a demo to see Kintsugi, powered by Vertex.
Why companies look for Vertex alternatives
Kintsugi covers the whole compliance workflow, from exposure monitoring to registration, filing, and state notices, with a free plan and paid plans from $75 per filing or registration. Here's what leads teams to compare options.
Pricing isn't published. Vertex doesn't list prices for O Series, so cost depends on a quote. Kintsugi publishes its pricing: a free plan, Starter from $75 per filing or registration, and a custom Premium plan with volume discounts.
Built around enterprise systems. Vertex describes O Series as a single tax engine integrated with all your transaction systems, including ERP, procurement, ecommerce, and billing, and deployable on-premise, in the cloud, or as a hybrid. That fits a company with several ERPs and an in-house tax team. A growing SaaS or ecommerce company often needs no-code connections to Shopify, Stripe, or Chargebee and someone to file the returns.
Tax determination versus the whole workflow. The O Series product page centers on tax calculation and rules content. Kintsugi's plans bundle nexus monitoring, registration, filing, remittance, exemption certificates, and a virtual mailbox for state notices. If you're evaluating Vertex, ask which compliance services are included in your quote.
Vertex alternatives at a glance
| Option | Published pricing (Sept 2026) | Coverage | Registration and filing | Error guarantee |
|---|---|---|---|---|
| Kintsugi | Free plan; from $75 per filing or registration; Premium custom | US; Canada, EU, UK, and 100+ countries on Premium | ✓ Included (auto-register, auto-file, remittance) | ✓ Kintsugi Guarantee |
| Avalara | From $79 per state/month (under $50M revenue); custom above; Priority and 24/7 support sold separately | US and 190+ countries | Filing included per state; registration $403 per location | None published |
| Sovos | Not published | 12,000+ US jurisdictions | Filing and managed filing services; pricing not published | None published |
| Anrok | From $100 per market, per month; custom plans | US and 150+ countries | Filing included; each state or country is billed as a separate market | None published |
| Numeral | Free monitoring; from $75 per filing plus $150 per registration | US; 90+ countries on Enterprise only | Included on Professional | Late filings only |
| Stripe Tax | 0.5% per transaction (no-code) or 50¢ per API transaction; filing bundles from $90/month | 100+ countries | Filing through partners | None published |
| Vertex (for reference) | Not published | 19,000 jurisdictions worldwide | Quote-based | Not published on its O Series page |
Kintsugi's international coverage and the Kintsugi Guarantee are on Premium.
The 6 best Vertex alternatives
1. Kintsugi (including Kintsugi, powered by Vertex)
Kintsugi is an AI-native sales tax, VAT, and GST platform for growing SaaS and ecommerce companies. Kintsugi, powered by Vertex, combines Vertex's O Series engine with Kintsugi's AI product categorization, free exposure monitoring, managed registrations, and automated filing.
- Pricing: A free plan includes global exposure monitoring, historical liability auditing, nexus threshold alerts, AI product categorization, and address validation. Starter begins at $75 per filing or registration. Premium is custom, with volume discounts. See pricing.
- Coverage: 13,000+ US jurisdictions, plus Canada, the EU, the UK, and 100+ countries on Premium.
- Integrations: 60+, including no-code Shopify, Stripe, Chargebee, and BigCommerce connections, and real-time calculation on invoices for QuickBooks, NetSuite, and Microsoft Dynamics 365 on Premium. API, SDK, and SSO are on Premium.
- Support: Dedicated onboarding and account teams with SLA-backed support on Premium, and the Kintsugi Guarantee: if our calculation or filing error leads to penalties or interest, we pay it.
Best for: Mid-market and growing companies that want the Vertex engine with registration, filing, and notices handled for them, at published starting prices.
2. Avalara
Watch for: Avalara's published plans cost from $79 per state per month and are only for companies under $50M in revenue. Above that, and for VAT or GST, pricing is a custom quote. Registration costs $403 per location. Avalara lists 1,400+ integrations, but fewer than 80 are built by Avalara; the rest are built and maintained by third-party partners. Avalara sells live chat, phone support, and faster responses as separate Priority and Enterprise Support plans, and sells hands-on Guided Implementation separately too. See our Avalara alternatives guide.
Best for: Companies above $50M in revenue that need several tax types from one vendor and will negotiate a custom quote, per-state pricing, and separately sold implementation and support.
3. Sovos
Watch for: Sovos doesn't publish pricing or an error guarantee on its sales and use tax page, so you'll need a quote to compare.
Sovos sells sales and use tax calculation, filing to 12,000+ US authorities, and a managed filing service run by its tax professionals. See our Sovos alternatives guide.
Best for: Large, regulated organizations buying on a quote, with no pricing or error guarantee published on its sales and use tax page.
4. Anrok
Watch for: Anrok bills each state or country as a separate market at $100 a month on Starter, so 10 markets cost $12,000 a year. It doesn't publish an error guarantee. See our Anrok alternatives guide.
Best for: SaaS companies in a handful of markets that can absorb $100 per market, per month, with no published error guarantee.
5. Numeral
Watch for: Registration costs $150 per state, twice Kintsugi's starting price, and global VAT and GST are on the custom Enterprise plan. Its guarantee covers late filings only.
Best for: US-focused sellers that can pay $150 per registration and don't need global coverage outside an Enterprise contract or a guarantee beyond late filings.
6. Stripe Tax
Watch for: Percentage-based pricing grows with revenue, and invoices from an ERP or sales outside Stripe aren't covered.
Best for: Businesses that bill only through Stripe and accept a per-transaction fee that grows with revenue, with filing through partners.
Which Vertex alternative fits?
| If you are... | Compare |
|---|---|
| A growing company that wants Vertex's engine with filing handled for it | Kintsugi, powered by Vertex |
| A SaaS or ecommerce company that needs filing handled | Kintsugi, Numeral |
| Above $50M in revenue with several tax types | Avalara, Sovos, Vertex |
| Selling SaaS internationally | Kintsugi (Premium), Anrok |
| Billing only through Stripe | Kintsugi, Stripe Tax |
How to move to Kintsugi
- Start on the free plan. Connect your sales and billing systems with no-code integrations, or import transactions by CSV. Exposure monitoring and historical liability auditing show where you have nexus.
- Map your systems. On Premium, Kintsugi calculates tax in real time on invoices in QuickBooks, NetSuite, and Microsoft Dynamics 365, and offers an API and SDK for custom stacks. Our team works through which systems send transactions to Kintsugi.
- Review registrations and filing ownership. Your registrations carry over. Decide which filing periods Kintsugi takes over in each state so nothing is filed twice.
- Connect state accounts and notices. Kintsugi files and remits, and its virtual mailbox collects state notices.
- Add registrations and clean up exposure. New registrations start at $75 each, and Premium includes back filing with voluntary disclosure agreement (VDA) options.
Premium includes a dedicated onboarding manager and account team.
Vertex alternatives FAQs
What is the best alternative to Vertex?
For growing and mid-market companies, Kintsugi, powered by Vertex, keeps the O Series engine and adds registration, filing, notices, and published starting prices. Large enterprises with several tax types tend to compare Avalara and Sovos.
How much does Vertex cost?
Vertex doesn't publish pricing for O Series; pricing is by quote. Kintsugi's paid plans start at $75 per filing or registration, with a free plan for exposure monitoring.
What is the relationship between Vertex and Kintsugi?
Vertex made a minority investment in Kintsugi in 2025 and partners with Kintsugi commercially. Kintsugi, powered by Vertex, pairs the Vertex O Series engine with Kintsugi's automation.
Does Kintsugi work with NetSuite and Microsoft Dynamics?
Yes. Kintsugi's Premium plan includes real-time tax calculation on invoices for QuickBooks, NetSuite, and Microsoft Dynamics 365.
For more tools, see our guide to the best sales tax software and TaxJar vs. Vertex vs. Kintsugi. Read more about Kintsugi, powered by Vertex, or book a demo.
